S-91264A807 5/8"-11 ASME B18.3, ASTM A574 Shoulder Screws

Key Features & Benefits at a Glance

• Exceptional tensile strength of 140,000 psi and Rockwell C32 hardness for superior load-bearing capacity and resistance to deformation in demanding applications.
• Integrated nylon pellet thread locker ensures vibration-resistant locking, maintaining clamp load integrity across a wide temperature range from -50°F to 250°F.
• Precision Class 3A thread fit and standard shoulder fit provide exact alignment and smooth assembly, reducing wear and improving operational accuracy.
• Black oxide finish on alloy steel offers enhanced corrosion resistance and a durable, low-glare surface for extended service life.
• Knurled socket head with hex drive allows for secure tool grip and high-torque installation, minimizing slippage and speeding up maintenance.
• 3-inch shoulder length with tight tolerances enables precise component positioning and acts as a reliable axle or pivot in machinery.
• Compliance with ASME B18.3, RoHS, and REACH ensures consistent quality, safety, and environmental standards for global industrial use.

Professional Applications & Engineering Value

This 5/8"-11 UNC shoulder screw is engineered to solve critical alignment and fastening challenges in heavy-duty environments. The alloy steel construction, combined with a black oxide finish, resists corrosion and wear, making it ideal for industrial machinery, automotive assemblies, and precision equipment where high tensile strength is non-negotiable. The coarse UNC thread and Class 3A fit facilitate quick, secure engagement, while the nylon pellet thread locker prevents loosening under vibration—common in motors and rotating systems. The 3-inch shoulder serves as a stable bearing surface, ensuring accurate pivot points and reducing stress on connected parts, which enhances overall engineering reliability and minimizes downtime.

Specification Summary & Compliance

This shoulder screw adheres to Class 3A thread fit and UNC thread standards for precise dimensional accuracy. Manufacturing follows ASME B18.3 specifications, with shoulder diameter tolerance of -0.004" to -0.002" and length tolerance of -0.005" to 0.005". The product is fully compliant with RoHS 3 (2015/863/EU) and REACH (EC 1907/2006) regulations, ensuring it meets stringent environmental and safety requirements for industrial use.